Can someone tell me what law the leaker broke?

[Ocelot II]

10. It isn't illegal; it's against the rules of the Supreme Court.

Just hours after Politico published a draft of the majority ruling written by Justice Samuel Alito calling the Roe decision "egregiously wrong from the start" and overruling that five-decade-old precedent, figures across the right issued a chorus of calls for the investigation and prosecution of the anonymous source of the "illegal" leak. CBS News went so far as to report—somewhat vaguely—that it expects an investigation “involving the FBI” into the leak's source. And Chief Justice John Roberts has opened an investigation into the disclosure.

But all of that furor is undermined by an inconvenient legal truth: Leaking a Supreme Court decision doesn't actually seem to be a crime—at least not by any clear and undisputed definition. "Right now, it's unclear whether the leaker broke any law at all," says Trevor Timm, a First Amendment–focused lawyer and the executive director of the Freedom of the Press Foundation. "Even the people claiming this act is beyond the pale and the FBI must investigate haven't pointed to a definitive law this leaker allegedly broke."

Timm cites a lengthy Twitter thread published late Monday by the well-known UC Berkeley legal scholar Orin Kerr, who responded to the leak Monday night by pointing out that a Supreme Court draft doesn't meet any of the obvious criteria that would make it an illegal document to hand to a journalist: Most important, it's not classified, so leaking it doesn't open the leaker to prosecution under the Espionage Act. "As far as I can tell, there is no federal criminal law that directly prohibits disclosure of a draft legal opinion," Kerr concluded.

https://www.wired.com/story/scotus-roe-v-wade-opinion-leak-legal-risk/

If the document were obtained by illegal means, as by hacking into a computer system, that might be prosecutable, but it doesn't appear that the leaking itself was illegal. So far the FBI is not involved; the court is conducting an internal investigation. The leaker, if discovered, will surely be fired, but probably not prosecuted.